Tropical Storm Isaias(pronounced “ees-ah-EE-ahs”)
www.weather.gov/ilm
Monday August 3, 2020
NWSWilmingtonNC
7:30 AM EDT
Prepared by: WFO Wilmington, NC
Next Briefing: 12:00 PM EDT Monday August 3 2020Disclaimer: The information contained within is time-sensitive. Do not use after 12:00 PM EDT Monday Aug 3, 2020
Briefing for northeast South Carolina and southeast North Carolina
What has changed: Tropical Storm Warnings Upgraded to Hurricane Warnings along the
coast
Faster arrival of Tropical Storm conditions
Incorporated 5 AM EDT NHC Advisory information
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
NOTE: Do not focus on the exact track. Impacts can occur well outside the area enclosed by the cone.
Isaias is expected to move through the area late today and tonight and lift north of the region during Tuesday morning.
Tropical Storm Warnings have been raised to Hurricane Warnings along the coast with some slight strengthening expected before landfall.
Tropical Storm force winds are expected across the area, arriving across northeast SC late afternoon/evening and southeast NC through the evening hours.
Life-threatening storm surge is possible along the immediate coast especially south of Cape Fear.
Impacts from wind, flooding rains, and tornadoes are also expected.
Situation OverviewTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
A Hurricane Warning is in effect for all
coastal counties. A Tropical Storm
Warning is in effect just inland from the
coast except Marlboro and Darlington
counties
A Storm Surge Warning is in effect for
Brunswick, Horry, and Georgetown
counties.
A Storm Surge Watch is in effect for
Pender and New Hanover counties.
A Flash Flood Watch is in effect for the
entire area.
Watches & WarningsTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Situation OverviewTropical Storm Isaias
Hazard Impacts Location Timing
Wind
Some damage to roofing and weak
structures. Downed trees, fences and signs
possible. Scattered power outages.
Most areas, but especially northeast SC
coastal areas
This evening into Tuesday
morning
Storm Surge/
Inundation
Potential storm surge impacts including
some flooding of coastal roads and beach
access, some damage and flooding to
vulnerable coastal structures, damage to
beach ramps and stairways, beach erosion
Especially northeast SC coastal areasEspecially around high
tide this evening (7-11pm)
Flooding Rain
Potential for moderate flooding impacts,
especially for poor drainage and low-lying
locations. Driving conditions will become
hazardous with some road closures.
Northeast SC and southeast NCThis afternoon and
tonight.
TornadoSome tornadoes possible with damage to
trees, structures, and power lines
Most areas but especially coastal areas
of Northeast SC and southeast NC
This afternoon and
tonight.
MarineHazardous marine conditions and
dangerous rip currents
All waters coastal and nearshore
waters, and beaches
Today and tomorrow.
Highest winds/seas
tonight.
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Threat LevelsTropical Storm Isaias
Wind SurgeRainfall
FloodingTornado
Incre
asi
ng T
hre
at
River
FloodingMarine
ConfidentModerate
ConfidenceConfident
Moderate
ConfidenceConfident Confident
For information on specific hazards in this area, please go to
https://www.weather.gov/ilm/tropical
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Tropical storm force winds are
expected across the area.
The most likely arrival of tropical
storm force winds is a little sooner
now, beginning as early as late this
afternoon or early evening for
northeast SC and later this evening
for southeast NC.
TS Wind Speed Probabilities & Arrival TimesTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
The chance of damaging, strong
tropical storm force winds (50kts) is
now 40-70% for much of area.
The chance of sustained hurricane
force winds is still relatively low.
Better chances for hurricane force
gusts.
50kt Wind Speed ProbabilitiesTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
There is a potential for moderate winds impacts across a large area of northeast SC and southeast NC
Potential impacts include some damage to roofing and siding, along with damage to porches, awnings, carports, and sheds
Large limbs and some trees down with scattered power outages
Some small craft may break loose if they are not properly moored
Wind Threat / Potential ImpactTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Potential sustained winds are
expected to be 50-60mph near the
coast and 20-40mph inland.
The potential for the highest sustained
winds is for coastal areas.
Areas with the highest winds can
expect downed trees/limbs, damage to
fences, awnings, and unanchored
mobile homes
In addition, some power outages are
likely where the highest winds occur.
Wind InformationTropical Storm Isaias
Note: These winds are highly dependent on the storm’s track and intensity. As a result, any change
could result in significant differences to the peak sustained winds that occur.
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Note: These winds are highly dependent on the storm’s track and intensity. As a result, any change
could result in significant differences to the peak wind gusts that occur.
Peak wind gusts of 60-80mph
expected near coast and 30-50mph
inland.
The coastal areas have the greatest
potential to see strong tropical storm
and hurricane force wind gusts.
Slight changes to the track can impact
the winds we receive.
Wind InformationTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Inland Flooding ImpactsTropical Storm Isaias
There is a moderate threat for flooding
Potential impacts include some low-lying
areas along roads flooded, flooding near
poor drainage and prone locations
Driving conditions will become hazardous
with some road closures possible
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Large swath of 4-6” of rain is expected
over much of the area with isolated
higher amounts possible
Localized flash flooding is possible within
bands of heaviest rainfall. Remember, most
flood related deaths occur in vehicles!
Turn Around, Don’t Drown.
The greatest potential for flooding is
tonight.
Expected Storm Total RainfallTropical Storm Isaias
Note: Rainfall amounts are highly dependent on the storm’s track. As a result, any change
could result in significant differences to the amount, and where the highest totals occur.
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
There is a potential for several tornadoes,
especially east of a Lumberton to Marion
and Kingstree line this evening through late
tonight.
Tornadoes can significantly damage homes,
destroy mobile homes, and uproot/snap
trees.
Have multiple ways to receive
warnings later today and tonight. The
best place to be during a tornado is in
an interior room of the lowest floor of
a solid structure away from windows.
Potential Tornado ImpactsTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
There is an elevated to moderate storm surge threat along the coast from Surf City south to the South Santee River.
Still most concerned with the area south of Cape Fear with this evening’s high tide (~7-11pm).
Areas of storm surge inundation enhanced by breaking waves are possible along barrier islands in the moderate threat area
Potential impacts include: flooding of some coastal roads and beach access points, beach erosion, some damage and flooding to vulnerable structures structures especially in areas with weakened dunes and adjacent to estuaries, damage to beach ramps and stairways
Potential Storm Surge ImpactsTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Storm SurgeTropical Storm Isaias
Potential storm surge inundation
of 3-5 ft from Cape Fear
southward along the northeast
SC coast, and
2-4 ft from Cape Fear northward
along the southeast NC coast.
Note: These are peak above ground
values if the peak surge occurs at the
time of high tide. The best chance of
this occurring is south of Cape Fear.
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Life-threatening rip currents are
expected through midweek.
Hazardous winds/seas are expected to
develop for the adjacent coastal waters
with the worst conditions this evening
through early Tuesday morning.
Maritime conditions are expected to
improve by Tuesday night into
Wednesday
Marine/Coastal HazardsTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
DAY/
THREATWED THU FRI SAT SUN
Severe Storms
LightningAll areas as a result of
scattered tstms
All areas as a result of
scattered tstms
All areas as a result of
scattered tstms
All areas as a result of
scattered tstms
All areas as a result of
scattered tstms
Heat IndexHeat Index: 100F all
areas in the afternoon
Heat Index: 100F all
areas in the afternoon
Heat Index: 100F all
areas in the afternoon
Heat Index: 100F all
areas in the afternoon
Heat Index: 100F all
areas in the afternoon
MarineStrong rip currents all
area beaches
Elevated rip current
risk will likely
continue
Risk Level None Limited Elevated Significant Extreme
5-Day OutlookTropical Storm Isaias
8/3/2020 7:26 AM www.weather.gov/ilm
Wilmington NCWEATHER FORECAST OFFICE
Key Take-AwaysTropical Storm Isaias
Tropical storm force winds expected by early evening for northeast SC and later this evening for southeast NC.
The gusty winds will produce downed trees, damage to weak structures and power outages.
Some storm surge inundation and beach erosion is likely, especially with this evening’s high tide south of Cape
Fear.
Heavy rainfall is expected along with some flooding of prone areas. Some road closures possible. Currently, most
areas are expected to receive 3-6” with some locally higher amounts possible.
Some tornadoes are possible - especially this evening and overnight.
Minor flooding is expected at many locations with a low chance of moderate river flooding – however this is
dependent on where the heaviest rainfall occurs.
Hazardous maritime conditions will develop later this weekend and especially tonight across adjacent coastal
waters. In addition, strong rip currents are possible today through midweek.
www.weather.gov/ilmNWSWilmingtonNC
The Next Briefing for northeast SC and southeast NC:
1200 PM Monday August 3, 2020
Method: Email
For the latest graphics and information go to: www.hurricanes.gov or weather.gov/ilm/tropical
Facebook: NWSWilmingtonNC
Twitter: NWSWilmingtonNC
YouTube: NWSWilmingtonNC
Web: http://weather.gov/ilm
E-mail: [email protected]
Top Related